Saw-mill dog



W. H. BENNETT.

SAW MILL DOG.

zzzzfmemzz UNITED STATES PATENT OFFICE WILLIAM H. BENNETT, OF PERU, INDIANA.

SAW-MILL DOG.

SPECIFICATION forming part of Letters Patent N0. 379,440, dated March 13, 1888.

Application filed November 12, 1887. Serial No. 254,973.

To all whom it may concern.-

Beit known that I, WILLIAM H. BENNETT, a citizen of the United States, residing at Peru, 1n the county of Miami and State of Indiana, have invented certain new and useful Improvements in Saw-Mill Dogs; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

This invention relates to certain new and useful improvements -in saw-mill dogs, and is designed more especially as an improvement upon the device shown in my Patent No. 335,419, dated February 2, 1886.

In the present construction I dispense with the holes in the rack-bar and dogs and the pins for engaging said holes to retain the brackets and dogs in their adj usted positions, providing a simpler and more efficient means of accomplishing this result. I also provide an improved dust-cap for the cogs and rack and pinion, and also a new form of dog, all as more fullyhereinafter described,and shown in the accompanying drawings, in whichy Figure I is a side elevation of niyiniproved saw-mill dog, showing it in use. Fig. 2 is an edge View thereof. Fig. 3 is a cross-section on the linea` .cof Fig. 2, and Fig. 4 is a perspective View ofthe dust-cap removed.

In said drawings, A represents the headblock of a saw-mill, to which the plate Bis attached in any suitable manner, said plate supporting in position my improved device.

C is a standard secured to said plate in any suitable manner, preferably in the way shown in my patent above referred to.

The standard C at its upper end is formed with an inwardly-extending slotted guide, a, through which extends the upper end of a rackbar, D, the teeth thereof, near its lower end, extending only a short distance of its length. The lower. end of the standard C terminates in a frame, E, which has a slot to correspond with the slot in the guide c, through which extends the lower end of the rack-bar D, as in the previous construction. To the frameE is held a second rack-bar, F, formed with a slotted bracket, b, through which extends horizontally the shank of the lower dog, G. The

(No model.)

rack-bars D F are both operated simultaneously, but in opposite directions, by the pinion H, which is keyed to a shortshaft, c, having its bearing in the frame E. To this shaft is connected one end of the lever I, provided with an adjustable weight, K.

L is a dust-cap formed with lugs d, through which pass screws or other suitable securing means to hold itto the upper eross-bar of the frame E, and also with slots c for the passage of the rack-bars.

M is a bracket on the rack-bar D, above the teeth thereof, and formed with a transverse slot to receive the shank of the upper dog, N.'

In place ofproviding the rack-bar andshanks of the dogs with perforations, (which I have found from experience to weaken them,) and in order to provide a quicker and better mode of adjusting the dogs, I pass the bars through the brackets vertically and the shanks of the dogs horizontally, as before, but make the slot in the bracket slightly larger than the bar and shank, so as to leave a space, f, to allow of free movement of either or both, and tap through the bracket a quick screw, O, bearing against the shank. Vith the screw turned outward, so as to allow free movement of the bar and shank, and the dogs G N adjusted to the desired positions, a slight movement of thelever P, connected to said screw, and weighted, as shown, presses the end of the screw or holder against the shank of the dog and forces it.

against the bar D, clamping them both tightly in position, the weight on the lever P holding the same in the adjusted position. In order to give strength to the screw ,Ipreferably cast on one side of the bracket a boss, g.

The dog G, I form with two points, m n, the upper one of which has its face at right angles to the lower side of the dog. The lower point is not engaged in ordinary flogging of the log. It projects at its point at a less distance than the upper point, preferably about one-half of an inch, and is designed to hold the last board cnt from the log, or small pieces being sawed, the outer face of the upper dog forming a side support.

I am aware that a sawmill dog` has heretofore been formed with two holding-points, and therefore do not seek to cover such, broadly. I deem it important that the points of the dog roo u project upon two different planes and that they be of different lengths, and that the longer of the two points be formed with two bevels, as shown, the outer one being substantially vertical and terminating above the point of the short prong, so that in ordinary clogging the short prong will be out ol the way; but when the log` becomes small the short prong will hold the last board and the larger prong will engage with its outer vertical face the side of the board and form a side support therefor. This is important.

Vhat I claim as new is" As an improved article of manufacture, a saw-mill dog provided with two points upon 15 different horizontal planes and of different lengths, with the outer face of the longer and upper point substantially vertical, substantially as and for the purpose described.

In testimony that I claim the above I have 2o hereunto subscribed my name in the presence of two witnesses.

VILLIAM H. BENNETT.

Witnesses:

N OTT N. ANTRIM, JAMES M. BROWN. 

